Viability and Antioxidant Effects of Traditional Cooling Rice Powder (bedak sejuk) Made from Oryza sativa ssp. Indica and Oryza sativa ssp. japonica on UVB-Induced B164A5 Melanoma Cells.

Ahmad Rohi Ghazali,Ummul Aqeela Balqees Mohamed Thaha,Muhamad Haziq Md Khalid,Nurul Najihah Ahmad Maulana,Raveena Vaidheswary Muralitharan,Sajidah Suhaifi,Tharsini Salyam,Rasyidah Mohamad Halim,Noorhisham Tan Kofli,Chan Kam Soon,Adibah Hanis Ahmad

doi:10.31557/apjcp.2020.21.11.3381

Ahmad Rohi Ghazali, Ummul Aqeela Balqees Mohamed Thaha + Show 9 more

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https://doi.org/10.31557/apjcp.2020.21.11.3381

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Abstract

Background:Traditional cooling rice powder (bedak sejuk) is a fermented rice-based cosmetic that is applied topically on one’s skin, as an overnight facial mask. According to user testimonies, bedak sejuk beautifies and whitens skin, whereby these benefits could be utilised as a potential melanoma chemopreventive agent. Objective:Hence, this study aimed to determine the effects of bedak sejuk made from Oryza sativa ssp. indica (Indica) and Oryza sativa ssp. japonica (Japonica) on UVB-induced B164A5 melanoma cells, and also identify the antioxidant capacities of both types of bedak sejuk. Methods:The optimum dose of Indica and Japonica bedak sejuk to treat the cells was determined via the MTT assay. Then, the antioxidant capacities of both types of bedak sejuk were determined using the FRAP assay. Results:From the MTT assay, it was found that Indica and Japonica bedak sejuk showed no cytotoxic effects towards the cells. Hence, no IC50 can be obtained and two of the higher doses, 50 and 100 g/L were chosen for treatment. In the FRAP assay, Indica bedak sejuk at 50 and 100 g/L showed FRAP values of 0.003 ± 0.001 μg AA (ascorbic acid)/g of bedak sejuk and 0.004 ± 0.0003 μg AA/g of bedak sejuk. Whereas Japonica bedak sejuk at 50 g/L had the same FRAP value as Indica bedak sejuk at 100 g/L. As for Japonica bedak sejuk at 100 g/L, it showed the highest antioxidant capacity with the FRAP value of 0.01 ± 0.0007 μg AA/g of bedak sejuk which was statistically significant (p < 0.05) when compared to other tested concentrations. Conclusion:In conclusion, Japonica bedak sejuk has a higher antioxidant capacity compared to Indica bedak sejuk despite both being not cytotoxic towards the cells. Regardless, further investigations need to be done before bedak sejuk could be developed as potential melanoma chemoprevention agents.

Highlights

The largest organ of the human body is the skin, which accounts for 16 % of the human body weight
Cytotoxicity of Indica and Japonica bedak sejuk The cytotoxicity of both types of bedak sejuk was evaluated against UVB-induced B164A5 melanoma cells via the MTT assay
The results demonstrated that both types of bedak sejuk were not cytotoxic to UVB-induced B164A5 melanoma cells

Summary

Introduction

The largest organ of the human body is the skin, which accounts for 16 % of the human body weight. The epidermis of the skin functions as a protective layer that separates organisms from the external environment This is crucial in counteracting environmental stressors such as ultraviolet (UV) light. Methods: The optimum dose of Indica and Japonica bedak sejuk to treat the cells was determined via the MTT assay. Results: From the MTT assay, it was found that Indica and Japonica bedak sejuk showed no cytotoxic effects towards the cells. As for Japonica bedak sejuk at 100 g/L, it showed the highest antioxidant capacity with the FRAP value of 0.01 ± 0.0007 μg AA/g of bedak sejuk which was statistically significant (p < 0.05) when compared to other tested concentrations. Conclusion: In conclusion, Japonica bedak sejuk has a higher antioxidant capacity compared to Indica bedak sejuk despite both being not cytotoxic towards the cells. Regardless, further investigations need to be done before bedak sejuk could be developed as potential melanoma chemoprevention agents

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